I may need to replace the cmp (camshaft position) sensors on my 2005 Mazda 6s 5door with the 3.0L V6 (5spd man.) but I'm not quite sure where the sensors or located. What I really need is either a good schematic/diagram/pic showing exactly where they are and/or step-by-step-instructions.

DTC P0340 Camshaft Position (CMP) Sensor Circuit . has single sensor . This is circuit problem , testing the electrical circuit's for the sensor before replacing the sensor should be done . Do you know how to test sensor circuit's ?

How To Diagnose Check Engine Light Code P0340 Cam Position Sensor

Camshaft Position (CMP) Sensor
Right side of the engine, above the timing chain cover, under the power steering pump

(1) Camshaft Position (CMP) Actuator Solenoid - Intake Bank 1
(2) Camshaft Position (CMP) Sensor - Intake Bank 1
(3) Camshaft Position (CMP) Sensor - Intake Bank 2
(4) Camshaft Position (CMP) Actuator Solenoid - Intake Bank 2
(5) Camshaft Position (CMP) Actuator Solenoid - Exhaust Bank 2
(6) Camshaft Position (CMP) Sensor - Exhaust Bank 2
(7) Generator
(8) A/C Compressor Clutch
(9) Camshaft Position (CMP) Actuator Solenoid - Exhaust Bank 1
(10) Camshaft Position (CMP) Sensor - Exhaust Bank 1

You say it runs fine. Some time low battery voltage will set it off. P0340
https://www.autocodes.com/p0340_mazda.html
Faulty Camshaft Position Sensor

Camshaft Position Sensor harness is open or shorted

Camshaft Position Sensor circuit poor electrical connection

Faulty starter motor

Starting system circuit

Dead (Weak) battery

Here's a link to what your sensor look's like. Duralast Camshaft Position Sensor SU2360 ReadReviews onDuralast SU2360 Here's another link to where it's at. Repair Guides Component Locations Camshaft Position cmp Sensor AutoZone com

Before you replace a part you may or may not need . Why ? What code ? Does the vehicle run ? There has been a lot of confusion on these vehicles with variable valve timing , mixing up cam sensors with camshaft actuators
DTC P0008: Engine Position System Performance Bank 1

DTC P0009: Engine Position System Performance Bank 2
The presence of DTCs P0008 and P0009 along with P0016, P0017, P0018, and P0019 indicates a possible condition with the primary timing chain and the alignment between both intermediate sprockets and the crankshaft. Or, the crankshaft reluctor wheel has moved and is no longer referenced to top dead center (TDC).

?€¢
Observe the scan tool CMP Desired, Actual, and Angle Variance parameters before a DTC sets. This may help to isolate whether a condition is specific to one camshaft, one bank, or caused by a condition with the primary crankshaft timing.

DTC Descriptors
DTC P0010: Intake Camshaft Position (CMP) Actuator Solenoid Control Circuit Bank 1

DTC P0013: Exhaust Camshaft Position (CMP) Actuator Solenoid Control Circuit Bank 1

DTC P0020: Intake Camshaft Position (CMP) Actuator Solenoid Control Circuit Bank 2

DTC P0023: Exhaust Camshaft Position (CMP) Actuator Solenoid Control Circuit Bank 2

DTC P2088: Intake Camshaft Position (CMP) Actuator Solenoid Control Circuit Low Voltage Bank 1

DTC P2089: Intake Camshaft Position (CMP) Actuator Solenoid Control Circuit High Voltage Bank 1

DTC P2090: Exhaust Camshaft Position (CMP) Actuator Solenoid Control Circuit Low Voltage Bank 1

DTC P2091: Exhaust Camshaft Position (CMP) Actuator Solenoid Control Circuit High Voltage Bank 1

DTC P2092: Intake Camshaft Position (CMP) Actuator Solenoid Control Circuit Low Voltage Bank 2

DTC P2093: Intake Camshaft Position (CMP) Actuator Solenoid Control Circuit High Voltage Bank 2

DTC P2094: Exhaust Camshaft Position (CMP) Actuator Solenoid Control Circuit Low Voltage Bank 2

DTC P2095: Exhaust Camshaft Position (CMP) Actuator Solenoid Control Circuit High Voltage Bank 2
DTC P0341: Intake Camshaft Position (CMP) Sensor Performance Bank 1

DTC P0342: Intake Camshaft Position (CMP) Sensor Circuit Low Voltage Bank 1

DTC P0343: Intake Camshaft Position (CMP) Sensor Circuit High Voltage Bank 1

DTC P0346: Intake Camshaft Position (CMP) Sensor Performance Bank 2

DTC P0347: Intake Camshaft Position (CMP) Sensor Circuit Low Voltage Bank 2

DTC P0348: Intake Camshaft Position (CMP) Sensor Circuit High Voltage Bank 2

DTC P0366: Exhaust Camshaft Position (CMP) Sensor Performance Bank 1

DTC P0367: Exhaust Camshaft Position (CMP) Sensor Circuit Low Voltage Bank 1

DTC P0368: Exhaust Camshaft Position (CMP) Sensor Circuit High Voltage Bank 1

DTC P0391: Exhaust Camshaft Position (CMP) Sensor Performance Bank 2

DTC P0392: Exhaust Camshaft Position (CMP) Sensor Circuit Low Voltage Bank 2

DTC P0393: Exhaust Camshaft Position (CMP) Sensor Circuit High Voltage Bank 2
I'm sorry but when dealing with these problems your best bet is to take your vehicle to a qualified repair shop , I have never see a DIY'ER correct the problem with these , an in the end always end up taking it to the dealer .

Definition of Diagnostic Trouble Code P1345 Audi: Ignition Coil Power Output Stage 3 Short to Ground BMW: Misfire Cylinder 2 with Fuel Cut-Off Buick: Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation Cadillac: Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation Chevrolet: Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation Ford: Cylinder Discrimination Signal (Signal From Camshaft Position Sensor) GMC: Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation Isuzu: Crankshaft Position - Camshaft Position Correlation Kia: No SGC Signal (1.6L) Lexus: Variable Valve Timing / CMP Sensor Range / Performance Lincoln: Cylinder Discrimination Signal (Signal From Camshaft Position Sensor) Mazda: Cylinder Discrimination Signal (from CMP sensor) Mercury: Cylinder Discrimination Signal (Signal From Camshaft Position Sensor) Oldsmobile: Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation Pontiac: Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation Saturn: Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation Toyota: Variable Valve Timing / CMP Sensor Range / Performance Volkswagen: Ignition Coil Power Output Stage 3 Short to Ground

EOBD II Error Code: P0016
Description:
Crankshaft Position (CKP)/Camshaft Position (CMP), Bank 1 Sensor A - Correlation
Indication:
Malfunction Indicator Lamp (MIL) ON.
Solutions:
Wiring.
Crankshaft position (CKP) sensor.
Camshaft position (CMP) sensor.
Mechanical fault.
Timing Issue.
Camshaft Adjuster.

Checks:
Check Setting of Timing Belt.
Check Timing of Intake/Exhaust Cams.
Check Cam Adjusters as per Repair Manual.

Camshaft Position (CMP) Sensor

• 3.0L (VIN S) ENGINE
• 3.0L (VIN U, 2) ENGINES

Print

3.0L (VIN S) Engine

Front of the engine attached to the forward cylinder head.

3.0L (VIN U, 2) Engines

Ford Sable, Taurus 2000-05
Camshaft Position Sensor

• DESCRIPTION & OPERATION
• REMOVAL & INSTALLATION
• TESTING

Print

Description & Operation

The Camshaft Position Sensor (CMP) is a variable reluctance sensor that is triggered by a high point on the left-hand exhaust camshaft sprocket. The CMP sends a signal relating camshaft position back to the PCM which is used by the PCM to control engine timing.
The CMP sensor detects the position of the camshaft. The CMP sensor identifies when piston No. 1 is on its compression stroke. A signal is then sent to the PCM and used for synchronizing the sequential firing of the fuel injectors. Coil-on-plug (COP) ignition applications use the CMP signal to select the proper ignition coil to fire. The input circuit to the PCM is referred to as the CMP input or circuit. DTC P0340 is associated with this sensor.

Removal & Installation

3.0L (VIN S) Engine

1. Before servicing the vehicle, refer to the Precautions section.
2. Disconnect the battery ground cable.
3. Remove the electrical connector.
4. Remove the bolt and the CMP sensor.
5. To install, reverse the removal procedure.
   
   

   Fig. Camshaft Position Sensor-3.0L (VIN S) Engine
   

3.0L (VIN U, 2) Engines

1. Before servicing the vehicle, refer to the Precautions section.
2. Disconnect the battery ground cable.
3. Remove the pin-type retainers and remove the accelerator cable snow shield.
4. Detach the spark plug wire retainer.
5. Detach the wiring harness from the intake manifold support.
6. Release the fuel charging wiring harness from the valve cover studs. Position the wiring harness away from the camshaft position sensor.
7. Disconnect the electrical connector.
8. Remove the screws and the CMP.
9. To install, reverse the removal procedure.
   NOTE Make sure that the fuel charging wiring harness is fully secured to the valve cover studs.
   

Testing

Fig. Testing the CMP sensor for voltage as the engine is running

Fig. Testing the VPWR circuit of the CMP sensor

1. Check voltage between the camshaft position sensor terminals PWR GND and CID.
2. With engine running, voltage should be greater than 0.1 volt AC and vary with engine speed.
3. If voltage is not within specification, check for proper voltage at the VPWR terminal.
4. If VPWR voltage is greater than 10.5 volts, sensor may be faulty.

Fig. Camshaft Position Sensor Connector

1. Before servicing the vehicle, refer to the Precautions section.
   WARNING Use only a high-impedance multimeter, otherwise damage to the PCM and/or sensors can result.
   
2. With the key OFF , disconnect the CMP sensor harness connector.
3. Measure the resistance of the CMP sensor.
   
   3.0L Engine: 250-1000 ohms
   
4. If the resistance measured is outside the limits given, replace the CMP sensor.

At the rear of the engine between the cylinder banks.

Definition of Diagnostic Trouble Code P1346 Audi: Ignition Coil Power Output Stage 3 Short to B+ BMW: Misfire During Start Cylinder 3 Buick: Intake Camshaft Position [CMP] Sensor System Performance Cadillac: Intake Camshaft Position [CMP] Sensor System Performance Chevrolet: Intake Camshaft Position [CMP] Sensor System Performance Ford: Fuel Level Sensor B Circuit GMC: Intake Camshaft Position [CMP] Sensor System Performance Lexus: VVT Sensor Rang/Performance Problem (Bank 1) Lincoln: Fuel Level Sensor B Circuit Mazda: Fuel Level Sensor B Circuit Mercury: Fuel Level Sensor B Circuit Oldsmobile: Intake Camshaft Position [CMP] Sensor System Performance Pontiac: Intake Camshaft Position [CMP] Sensor System Performance Saturn: Intake Camshaft Position [CMP] Sensor System Performance Toyota: VVT Sensor /Camshaft Position Sensor Circuit Range/ Performance Problem (Bank 1) Volkswagen: Ignition Coil Power Output Stage 3 Short to B+

P0340 is a Crankshaft Position Sensor error. It determines firing order and is most likely the cause of your problem. It's mounted near the oil filter on the engine block. Below is a picture of how it appears in your car. Best of luck.
Greg